Well thet Asus Saberooth P67 does certainly support SLI, and there is three slots of spacing between your PCIe 16x, but the only issue is your case would need to have room for one slot below your motherboard if you went SLI because there would be one slot worth of over hang. As long as that didn't hit your PSU then you could SLI the triple slot on your board. If you can you get me a link to your case then I can tell you whether or not it will work.